In former days aquafortis, or nitric acid was used to test the genuineness of gold, which remains unaffected by the action of other acids, to assist in making valuations when buying or selling. The acid test - the name goes back to the Middle Ages - was accepted as definitive and, in its more general modern sense, still is.

The website is http://users.tinyonline.co.uk/gswithenbank/sayings.htm [Links inactive - To make links active and clickable, login or click here to register]

it has a lot of interesting info.

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